Folding bed frame

ABSTRACT

A folding bed frame that includes four vertical faces: two ends and two sides. Each face is formed by two slanting bars that are cross hinged together. The upper and lower ends of adjacent slanting bar sets are hinged together to form the whole frame structure. The two vertical faces are corresponding or symmetric, and each includes two sets of slanting bar sets that are hinged through to middle sections of the upper and lower angle plates. There is a vertical rod part on the cross-hinging point of each set of slanting bar set, and its movable position is set by a slide bushing. There is a barrier that is on the cross-hinging point of one of the slanting bars. The barrier can contact the upper part vertical bar, and form two support points with the slide bushing for the vertical bar part.

BACKGROUND OF THE INVENTION Field of the Invention

This invention is to folding furniture category. Specifically, it refers to a type of improvement for a folding bed frame.

Technical Background

Current camp beds evolved from folding chairs. Their structure includes a bed fabric and frame. For example, Chinese patent CN02228784.1 provides a type of camp bed with a frame relationship as shown in FIG. 8. It is divided into four vertical faces: two heads (as conventionally called) and two sides. Each face is formed by two slanting bars that are cross hinged together. The upper and lower ends of adjacent slanting bar sets are hinged together to form the whole frame structure. The two side vertical faces are symmetric, and each is formed by two sets of slanting bars cross hinged at the upper and lower angle plates. There is a movable positioning vertical bar part at the cross-hinging point of each set of slanting bars. The upper end of the vertical bar part is connected to a connection plate. A horizontal bar is hinged in each of the two horizontal directions of the connection plate. The other end of each horizontal bar is hinged to the upper angle plate of the vertical face on the same side. The horizontal bars of the two side vertical faces form a balance to support the bed fabric. The configuration of the two side horizontal bars allows the bed fabric to be flatter. It also resolves the problem with the bed fabric between the two crossed bars of the slanting bar sets sagging when bearing weight. However, when the bed fabric bears weight, the four horizontal bars are pulled by the inward stretching force, thus causing the connection plate location to have significant inward retraction and deformation, which affects its sleeping comfort. An objective of this invention is to promote even support of the bed fabric.

SUMMARY OF THE INVENTION

A primary goal of this invention is to provide a folding bed frame that can prevent the upper section of the vertical bar from retracting inwards.

One technical proposal of the invention is achieved as follows:

A folding bed frame includes four vertical faces: two ends and two sides. Each face is formed by two slanting bars that are cross-hinged together. The upper and lower ends of adjacent slanting bar sets are hinged together to form the whole frame structure. The two vertical faces are corresponding or symmetric, and each includes two sets of slanting bar sets that are hinged through to middle sections of the upper and lower angle plates. There is a vertical rod part on the cross-hinging point of each set of slanting bar set, and its movable position is set by a slide bushing. Between the two crossed slanting bars, the bar that is closer to the vertical bar is the primary slanting bar, and the bar that is farther from the vertical bar is the secondary slanting bar. The upper end of the vertical bar part is connected to a connection plate. A horizontal bar is hinged to each of the two horizontal directions of the connection plate. The other end of each horizontal bar is hinged to the upper angle plate of the vertical face of the same side. Its characteristics are that there is a barrier that is fixed on the cross hinging point of the primary slanting bar. The barrier can contact the upper part vertical bar, and form two support points with the slide bushing for the vertical bar part.

The barrier forms an inverse L-shaped or U-shaped structure. The two ends are riveted on the surface of the primary slanting bar. Its upward arch can contact the upper part of the vertical bar.

One side of the barrier contacts the upper part of the vertical bar part, while the other side contacts the secondary slanting bar. The lower part facing the secondary slanting bar has a thickened step section. When the frame is in its open position, the step section can support the lower side of the secondary slanting bar.

The barrier is molded plastic. In its thicker direction it has reinforcing ribs, and its elongated direction has embedded metal bars. The length of the metal bars crosses over the vertical bar part and the secondary bar.

The cross section of the barrier is a rectangular “Π” (Squared U shaped) with the opening facing downward. After the metal bars are embedded through the opening, they are riveted by two rivets on the barrier step section to form a thickened section facing down.

This invention uses the barrier on the slanting bars to enhance the horizontal support for the vertical bars from a traditional single-point support by slide bushing to two-point support. This can effectively prevent the defect of the upper part of a vertical bar retracting inwardly due to weight. In addition, the inner side of the barrier is supported by the other slanting bar of the slanting bar set. This enhances the connectivity between the two slanting bars of a slanting bar set, as well as increases the support for the vertical bar part.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an illustration of the folding bed frame.

FIG. 2 shows an enlarged image of selection A from FIG. 1.

FIG. 1 is an illustration of the upward view of the folding bed frame.

FIG. 4 shows a zoomed image of selection B from FIG. 3.

FIG. 5 is an illustration of the side view of the folding bed frame.

FIG. 6 illustrates a detailed illustration of the barrier.

FIG. 7 is an illustration of the folded state of the folding bed frame.

FIG. 8 is an illustration of existing, prior art technology.

Similar reference characters denote corresponding features consistently throughout the attached drawings. Namely, in the drawings the following reference numbers refer to the following part:

-   1—slanting bar set -   11—primary slanting bar -   12—secondary slanting bar -   2—upper angle plate -   3—lower angle plate -   4—slide bushing -   5—vertical bar -   51—connection plate -   52—horizontal bar -   6—barrier -   61—upward arch -   62—step section -   63—thickened section -   64—reinforcing rib -   65—metal bar -   X—vertical faces of the two ends -   Y—vertical faces of the two sides

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S)

Referring now to FIG. 1 to FIG. 7, a folding bed frame is shown that includes four vertical faces: two ends and two sides, as seen in the vertical faces of the two ends X and the vertical faces of the two sides Y. Each vertical face has a slanting bar set 1 that is formed by two slanting bars cross-hinged together. The upper and lower ends of adjacent slanting bar sets are hinged together to form the whole frame structure. In other words, the upper and lower ends of the slanting bars are hinged to the upper angle plate 2 and the lower angle plate 3 to form the whole connected frame structure. The two vertical faces are corresponding or are symmetric, and each includes two slanting bars sets 1 that are hinged through to middle sections of the upper and lower angle plates 2 and 3. There is a vertical rod part on the cross hinging point of each set of slanting bar set 1, and its movable position is set by a slide bushing 4. For an accurate description and convenient differentiation, between the two crossed slanting bars, the bar that is close to the vertical bar 5 is the primary slanting bar 11, and the bar that is far from the vertical bar is the secondary slanting bar 12. The upper end of the vertical bar 5 is connected to a connection plate 51. A horizontal bar 52 is hinged to each of the two horizontal directions of the connection plate 51. The other end of each horizontal bar 52 is hinged to the upper angle plate 3 of the vertical face of the same side. The horizontal bar 52 parallel to the vertical faces of the two sides Y tightly stretches the bed fabric. This is the current technology section. Because the vertical bar 5 solely relies on slide bushing 4 for positioning, when the bed fabric bears weight, the horizontal force causes the upper section of vertical bar 5 to retract inwardly and the bed fabric to become loose. The following structure is used to resolve this problem.

There is a barrier 6 that is fixed on the cross-hinging point of the primary slanting bar 11. The barrier 6 can contact the upper part vertical bar 5, and form two support points with the slide bushing 4 for the vertical bar part. More specifically, barrier 6 forms an inverse L-shaped or U-shaped structure. The two ends are riveted on the surface of the primary slanting bar 11. Its upward arch 61 can contact the upper part of the vertical bar 5. Here, barrier 6 forming an inverse L-shaped or U-shaped structure is just a figurative expression. It can resemble an inverse triangle, an inverse V-shaped, or a curve.

Furthermore, one side of the barrier 6 contacts the upper part of the vertical bar part 5, while the other side contacts the secondary slanting bar 12. The lower part facing the secondary slanting bar 12 has a thickened step section 62. When the frame is in open position, the step section 62 can support the lower side of the secondary slanting bar 12, and form a connected and weight-bearing support. In addition, barrier 6 also leverages its interconnection with the secondary slanting bar 12 to obtain support on the back side and enhance the ability of the upward arch 61 to withstand inward retraction. The position of barrier 6 occupies the spaces between the vertical bar 5 and the secondary slanting bar 12. Also, the step section 62 forms the thickened section 63 in the lower section, and it occupies the space in the primary slanting bar 11 when folded and the secondary slanting bar 12 when opened as shown in FIG. 7.

As shown in FIG. 6 and FIG. 7, the barrier 5 is ideally an inverse L-shape. This guarantees a higher upper arch 61, and a longer flat straight edge that enhances the support for the secondary slanting bar 12 as well as obtain support from the secondary bar. The barrier 6 is molded plastic. The thickness direction has reinforcing ribs 64, and the length direction has embedded metal bars 65. The length of the metal bars 65 crosses over the vertical bar 5 and the secondary bar 12. This increases the strength of the barrier 6 that is molded with plastic and decreases friction between metal. The cross section of the barrier 6 is a rectangular “Π” with the opening facing downward. After the metal bars 65 are embedded through the opening, they are riveted by two rivets on the barrier step section to form a thickened section 63 facing down. This has the benefits of reinforcing the thick area while allowing the thin area does not occupy extra space. 

I claim:
 1. A folding bed frame including: four vertical faces, namely, two ends and two sides; each face is formed by two slanting bars that are cross hinged together; the upper and lower ends of adjacent slanting bar sets are hinged together to form the whole frame structure; the two vertical faces are corresponding or symmetric, and each includes two sets of slanting bar sets that are hinged through to middle sections of the upper and lower angle plates; there is a vertical rod part on the cross-hinging point of each set of slanting bar set, and its movable position is set by a slide bushing; between the two crossed slanting bars, the bar that is close to the vertical bar is the primary slanting bar, and the bar that is far from the vertical bar is the secondary slanting bar; the upper end of the vertical bar part is connected to a connection plate; a horizontal bar is hinged to each of the two horizontal directions of the connection plate; the other end of each horizontal bar is hinged to the upper angle plate of the vertical face of the same side; its characteristics are: there is a barrier that is fixed on the cross hinging point of the primary slanting bar; and the barrier can contact the upper part vertical bar, and form two support points with the slide bushing for the vertical bar part.
 2. The folding bed of claim 1, wherein the barrier forms an inverse L-shaped or U-shaped structure; the two ends are riveted on the surface of the primary slanting bar; and the upward arch can contact the upper part of the vertical bar.
 3. Per claim 2, the folding bed frame has the following characteristics: one side of the barrier contacts the upper part of the vertical bar part, while the other side contacts the secondary slanting bar. The lower part facing the secondary slanting bar has a thickened step section. When the frame is in open position, the step section can support the lower side of the secondary slanting bar.
 4. The folding bed of claim 3, wherein the barrier is molded with plastic; THE thickness direction has reinforcing ribs, and the length direction has embedded metal bars; the length of the metal bars crosses over the vertical bar part and the secondary bar.
 5. The folding bed of claim 4, wherein the cross section of the barrier is a rectangular, squared U shape with the opening facing downwards; and wherein when after the metal bars are embedded through the opening, they are riveted by two rivets on the barrier step section to form a thickened section facing down. 